Hello Amitkumar Karwar,
The patch ed1ea6f42ece: "mwifiex: do le_to_cpu conversion for Rx
packet header elements" from Aug 3, 2012, leads to the following
static checker warning:
drivers/net/wireless/marvell/mwifiex/sta_rx.c:251 mwifiex_process_sta_rx_packet()
error: buffer overflow 'priv->rx_seq' 8 <= 255 user_rl='0-255'
drivers/net/wireless/marvell/mwifiex/sta_rx.c
187 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
188 struct sk_buff *skb)
189 {
190 struct mwifiex_adapter *adapter = priv->adapter;
191 int ret = 0;
192 struct rxpd *local_rx_pd;
193 struct rx_packet_hdr *rx_pkt_hdr;
194 u8 ta[ETH_ALEN];
195 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
196 struct mwifiex_sta_node *sta_ptr;
197
198 local_rx_pd = (struct rxpd *) (skb->data);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Smatch distructs skb->data like the plague.
199 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
200 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
201 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
202 seq_num = le16_to_cpu(local_rx_pd->seq_num);
203
204 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
205
206 if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
207 mwifiex_dbg(adapter, ERROR,
208 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
209 skb->len, rx_pkt_offset, rx_pkt_length);
210 priv->stats.rx_dropped++;
211 dev_kfree_skb_any(skb);
212 return ret;
213 }
214
215 if (rx_pkt_type == PKT_TYPE_MGMT) {
216 ret = mwifiex_process_mgmt_packet(priv, skb);
217 if (ret)
218 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
219 dev_kfree_skb_any(skb);
220 return ret;
221 }
222
223 /*
224 * If the packet is not an unicast packet then send the packet
225 * directly to os. Don't pass thru rx reordering
226 */
227 if ((!IS_11N_ENABLED(priv) &&
228 !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
229 !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||
230 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
231 mwifiex_process_rx_packet(priv, skb);
232 return ret;
233 }
234
235 if (mwifiex_queuing_ra_based(priv) ||
236 (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
237 local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
238 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
239 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
240 local_rx_pd->priority < MAX_NUM_TID) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
We check ->priority here.
241 sta_ptr = mwifiex_get_sta_entry(priv, ta);
242 if (sta_ptr)
243 sta_ptr->rx_seq[local_rx_pd->priority] =
244 le16_to_cpu(local_rx_pd->seq_num);
245 mwifiex_auto_tdls_update_peer_signal(priv, ta,
246 local_rx_pd->snr,
247 local_rx_pd->nf);
248 }
249 } else {
250 if (rx_pkt_type != PKT_TYPE_BAR)
251 priv->rx_seq[local_rx_pd->priority] = seq_num;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
But not on this path.
252 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
253 ETH_ALEN);
254 }
255
256 /* Reorder and send to OS */
257 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
258 ta, (u8) rx_pkt_type, skb);
259
regards,
dan carpenter
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